When kernel variants were renamed in
69cd6ff843
these dtb vars were forgotten, making it impossible to boot a kernel
build with `pmbootstrap build linux-postmarketos-exynos4`, no dtb is
appended to the zImage and we get stuck on samsungs boot logo.
The existing device package and its dependencies are for i9305, but
renaming them to i9300 makes more sense, as the i9300 is the base
version (SIII) and the i9305 (SIII LTE) is the improved version.
